This is the part that is very off-putting to me…
You order a new Taylor and you have no idea what you are going to receive, a black ebony fingerboard or a black and yellow fingerboard of a varying amount from barely noticeable to very pronounced. Basically, what this amounts to is Taylor is arbitrarily deciding that some people are getting a first grade (all black) fretboard, while others are receiving a 2nd or 3rd (or lower) grade fretboard…all at the same price and with no input from the customer…they get what they get. Doesn't seem a wise policy to me and it would totally prevent me from ever ordering a guitar with that possibility. They can "sell" it as environmentally a good thing, "green," etc but it still amounts to the fact that an all black ebony fretboard is a better grade of ebony than a marbled one. If you are OK with the fact that my new 8xx came with a first grade (black) fretboard and yours came with one having as much yellow as black, then it truly doesn't matter and this concern of mine has no meaning to you.
Now, for me personally, it doesn't matter from a practical viewpoint though I strongly object to the marketing philosophy. There's no way I'd buy a new guitar in the price ranges we're talking about without playing it first so if I selected one with a a marbled fretboard, it would be because I liked the look of the entire guitar as well as its sound.